Hey guys,

I just picked up an NA8 with a GT25 Kraken/FM build and a MS3. It's about 41f outside and the car is hesitating when applying slow throttle at idle. It was tuned on a Dyno initially then ironed out by a remote tuner. It was driven only in the summer so this problem was never apparent till now.

Can someone take a look at my logs and help me see if there is a big issue or if this is a small fix? One tuner wants to charge a min of 2 hours, the other 10 hours.... I'd love to get an idea before diving in.

Files:

1. First Log Short Cruise: It's a bit longer but you'll see a few times near the start where I eased the gas in different spurts. I think at the end I did a boost pull.
2. Throttle Taps at a stop in neutral: Exactly as it sounds. I tried some half taps, quick taps, foot to the floor quick tap.

Let me know what ya'll think. If you ever come to Victoria I would treat you to a nice dinner.

I've added the Fuel table and an example of a boost pull:


Fuel Map

Test Pull




Idle blips

 

I'm away from my computer at the moment so I haven't looked at your datalogs at all. With that said, ASSUMING your car was running well when it was warmer outside, you should not be changing your VE table, as your issue lies with the MAT correction (manifold air temp). Again, this only applies if your fueling was correct during warmer air temps.
Back when I had my car I would look at my average EGO correction during a drive, and add (typically would not have to remove fuel, as the MAT correction algorithm runs lean in my experience) that percent into the MAT correction curve. This gets you close, but I would then dial it in with a WOT pull and make the respective changes at that air temp. Hope this helps.

 

Thanks, yea I've been hearing something similar.